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Finding the Fourth Proportional to 286.45, 428.64 and 248.06

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Solution

The fourth proportional to 286.45, 428.64 and 248.06 is: 371.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.45 : 428.64 = 248.06 : x
  2. Step 2: Convert to fraction form
    286.45/428.64 = 248.06/x
  3. Step 3: Cross multiply
    286.45x = 428.64 × 248.06
  4. Step 4: Simplify right side
    286.45x = 106,329.06
  5. Step 5: Solve for x
    x = 106,329.06/286.45
  6. Step 6: Final answer
    x = 371.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.